Safari cannot play videos from youtube or other websites

I recently tried to go online to view a video for my class. However, when I clicked on the link, it just was a blank screen. When I tried to go to Youtube and watch videos, I got a blank black screen where the video should be. Can you help me please? Thanks.

Launch Disk Utility. (Applications/Utilities) Select MacintoshHD in the panel on the left, select the FirstAid tab. Click: Repair Disk Permissions. When it's finished from the Menu Bar, Quit Disk Utility and restart your Mac. If you see a long list of "messages" in the permissions window, it's ok. That can be ignored. As long as you see, "Permissions Repair Complete" when it's finished... you're done. Quit Disk Utility and restart your Mac.

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